Sorry for the late reply to this. December has been so busy I didn’t even make it back to check the Unreal forums.
Everyone who signed up is going to get an early notice for early access. We are going to be charging for it in most cases, however we can be flexible for unfunded projects. Please note that we haven’t done as much with Datasmith yet. Watch for an email to all early registrants. It will contain instructions on what to do. All people who sign up via our website will get early access first, and we can work with some of the people who have unique needs.
The Scene Fusion plugin is a source code plugin, so it should be completely extensible. For larger clients, we participate in the extensions.